The all-new, enhanced DRSG by Serta® mattress provides even better pressure-relieving comfort and support, while maintaining a balanced sleeping temperature to help promote undisturbed sleep. Inside the DRSG by Serta® Mattress, Serta’s Cool Twist Gel Memory Foam is designed to deliver cool, contouring pressure relief for the best sleep you’ve had in ages. Up to 1000 Edition Custom Support™ Coils System for exceptional support and reduced motion transfer, plus Serta’s BestEdge® Foam Encasement technology, an extra-deep foam rail made to help reduce edge roll-off and extend the sleep surface. Select models also include Serta’s Perfect Response Latex. This extremely breathable and durable foam provides gentle cushioning to relieve pressure points, while also providing enhanced support. The natural properties of latex help protect your mattress against dust mites. (DRSG IV & V Models Only)